Bump actions/checkout from 5 to 6

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/changelog.yml

@@ -46,7 +46,7 @@ jobs:
     runs-on: Ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
       with:
         ref: ${{ github.event.inputs.ref }}
 

.github/workflows/doc-pr-cherry-pick.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493 # 4.2.2
+        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # 4.2.2
         with:
           fetch-depth: 0
 

.github/workflows/run-bundle-test.yml

@@ -17,7 +17,7 @@ jobs:
         python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
         os: [ubuntu-latest, macOS-latest]
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

.github/workflows/run-dep-tests.yml

@@ -16,7 +16,7 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@ff7abcd0c3c05ccf6adc123a8cd1fd4fb30fb493
+    - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@e797f83bcb11b83ae66e0230d6156d7c80228e7c
       with:

.github/workflows/run-tests.yml

@@ -16,7 +16,7 @@ jobs:
         os: [ubuntu-latest, macOS-latest, windows-latest]
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Set up Python ${{ matrix.python-version }}
       uses: actions/setup-python@v6
       with:

.github/workflows/update-lockfiles.yml

@@ -31,7 +31,7 @@ jobs:
         os: [macOS-latest, windows-latest]
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.inputs.ref }}
       - name: Set up Python ${{ matrix.python-version }}